Why google calculator gives $\sin 90^\circ = 0.8939966636$

Question

Why Google calculator shows $\sin 90^\circ = 0.8939966636$, when we all know that $\sin 90^\circ = 1$ ?

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Answer 1

NOTE: DEG stands for degrees and RAD for radians

Now we need to know two things here, that are :

1. Sin ( 90 DEG ) = 1

2. Sin ( 90 RAD ) = 0.8939966636

So, When we do a google search for Sin 90 without passing the measure it's by-default radians.

Now you know there is nothing wrong with Google Search.

Comment to OP by Sil - Use sin 90 deg into google if you really want degrees.